vapor lock - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-26-2010, 11:22 PM
Registered User
 
Join Date: Jul 2010
Location: butte mt
Posts: 2
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
vapor lock

hi am tom am from butte mt and i have a 55 chevy 4 dr with a 406 small blk and a 6 spd still in finish process and i have a built 54 chevy 5 window with a tuned port 350 i am having a fuel problem i drive it for about 5 min and she starts running out of fuel i have 43 pounds of pre after market regulator i cant enjoy this trk becuse i havent drove it becuse of this problem and when it dies the fuel pressure gauge drops to 0 on the gauge

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-27-2010, 12:28 AM
327NUT's Avatar
Registered User
 
Last photo:
Join Date: Dec 2004
Location: So. Utah
Age: 68
Posts: 3,275
Wiki Edits: 0

Thanks: 0
Thanked 84 Times in 75 Posts
Wow!!!! thats all I can say.....no wait, Tom, have you changed the fuel filter lately.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-27-2010, 12:36 AM
Overdriv's Avatar
Member
 
Last photo:
Join Date: May 2005
Location: IL
Age: 64
Posts: 740
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
Not sure what you got going on, but a few ideas maybe. Tuned port, I'm guessing 82-92 TPI??

If so, the TPI had a fuel pump in the tank and a fuel regulator after the fuel rails, not before.

The unused fuel was sent back to the tank via a separate line.

The TPI fuel system would hold needed fuel pressure on the rails for quite a while after engine was shut off.

A little more detail of the way you have it set up would help.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-27-2010, 09:56 AM
Registered User
 
Join Date: Jul 2010
Location: butte mt
Posts: 2
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
vapor lock

yes sir it is a 88 tpi motor this what i have it has a in line holley fuel pump and the regulator is after the rail and it dose have a return line to the tank but i do not have any fuel filters installed yet i wouldn't think that would cause my problems
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-27-2010, 06:52 PM
bigdog7373's Avatar
Of course it's fast
 
Last photo:
Join Date: May 2010
Location: florida
Posts: 2,673
Wiki Edits: 0

Thanks: 13
Thanked 49 Times in 49 Posts
can you please use some punctuation. im getting a headache trying to figure out what you're saying.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-28-2010, 08:41 AM
Overdriv's Avatar
Member
 
Last photo:
Join Date: May 2005
Location: IL
Age: 64
Posts: 740
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by tommy22
yes sir it is a 88 tpi motor this what i have it has a in line holley fuel pump and the regulator is after the rail and it dose have a return line to the tank but i do not have any fuel filters installed yet i wouldn't think that would cause my problems
The first thing I would do is check fuel pressure at the rail. Leave your gauge on and take a ride, tape it to the windshield.

With no filters, you could have already trashed the pump. When you use electric pumps, you need a 100 micron filter before the pump and a 10 micron after the pump. Even if your system is new and clean, this is what most of the pump manufacturers recommend.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 07-28-2010, 10:05 AM
XNTRCI-T's Avatar
AKA Lee in KC
 
Last photo:
Join Date: Apr 2006
Location: Overland Park, KS
Age: 66
Posts: 530
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by bigdog7373
can you please use some punctuation. im getting a headache trying to figure out what you're saying.
Montana, being the independent cusses they are, has outlawed speed limits and punctuation. Welcome to Montana, now leave!!
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 07-28-2010, 12:17 PM
Registered User
 
Join Date: Nov 2007
Location: utah
Posts: 416
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by tommy22
yes sir it is a 88 tpi motor this what i have it has a in line holley fuel pump and the regulator is after the rail and it dose have a return line to the tank but i do not have any fuel filters installed yet i wouldn't think that would cause my problems

Im afraid it could cause the problem. You may have plugged injectors, very easy to do without filters. If there is a restriction anywhere in the system it will cause the rest of the fuel delivery to be weak and it will run out. That includes the return line, it needs to be larger than the supply line. You need to find the restriction. It could be a pinched supply line, bad regulator, bad fuel pump.

My experience with fuel injection is not with your particular system, but your statement about the regulator being after the rail made me wonder, it that where it is supposed to be? Does that mean there is a regulator on the "return" side? The systems Ive worked on have a wide open return line. I would think the regulator would need to be on the supply side to protect the injectors.

Just ignore the "nunciation police". They are just jealous of your truck..
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 07-28-2010, 01:28 PM
Rickracer's Avatar
ASE Master Tech, Fabricator
 
Last wiki edit: Taurus 2-speed fan control wiring diagram Last photo:
Join Date: Jan 2010
Location: Kissimmee, Florida
Age: 55
Posts: 937
Wiki Edits: 8

Thanks: 0
Thanked 3 Times in 3 Posts
Quote:
Originally Posted by 65smallblock
.... That includes the return line, it needs to be larger than the supply line. ... is that where it is supposed to be? Does that mean there is a regulator on the "return" side? I would think the regulator would need to be on the supply side to protect the injectors.
Nope, on GMs, the supply line is 3/8", the return is 5/16, and the regulator is after the injectors. It returns any volume/pressure above ~43 psi back to the tank. I would suspect the in-line Holley pump, especially if you have no filters in-line to protect it.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 12:01 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.